MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Kinetics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Fora unimolecular reaction |
| A. | the order and molecuiarity of the slowest step are equal to one |
| B. | molecuiarity of the reaction can be zero, one or two |
| C. | molecuiarity of the reaction can be determined only experimentally |
| D. | more than one reacting species are involved in one step |
| Answer» B. molecuiarity of the reaction can be zero, one or two | |
| 2. |
The number of molecules of the reactants taking part in a single step of the reaction is indicative of |
| A. | order of a reaction |
| B. | molecuiarity of a reaction |
| C. | fast step of the mechanism of a reaction |
| D. | half-life of the reaction |
| Answer» C. fast step of the mechanism of a reaction | |
| 3. |
The unit of rate and rate constant are same fora |
| A. | zero order reaction |
| B. | first order reaction |
| C. | second order reaction |
| D. | third order reaction |
| Answer» B. first order reaction | |
| 4. |
For a reaction nx y z the rate of reaction becomes twenty seven times when the concentration of X is increased three times. What is the order of the reaction? |
| A. | 2 |
| B. | 1 |
| C. | 3 |
| Answer» D. | |
| 5. |
The rate constant of a reaction depends upon |
| A. | temperature of the reaction |
| B. | extent of the reaction |
| C. | initial concentration of the reactants |
| D. | the time of completion of reaction |
| Answer» E. | |
| 6. |
Fora reaction x + y z, rate |X|. What is (i) moleculariiy and (ii) order of reaction? |
| A. | (i)2, (ii) 1 |
| B. | (i)2,(ii) 2 |
| C. | (i) 1, (ii) 1 |
| D. | (i) 1, (ii) 2 |
| Answer» B. (i)2,(ii) 2 | |
| 7. |
A reaction in which reactants (R) are converted into products (P) follows second order kinetics. If concentration of R is increased by four times, what will be the increase in the rate of formation of P? |
| A. | 9 times |
| B. | 4 times |
| C. | 16 times |
| D. | 8 times |
| Answer» D. 8 times | |
| 8. |
The activation energy in a chemical reaction is defined as |
| A. | the difference in energies of reactants and products |
| B. | the sum of energies of reactants and products |
| C. | the difference in energy of intermediate complex with the average energy of reactants and products |
| D. | the difference in energy of intermediate complex and the average energy of reactants |
| Answer» E. | |
| 9. |
Rate of which reaction increases with temperature? |
| A. | Exothermic reaction |
| B. | Endothermic reaction |
| C. | (a) and (b) both |
| D. | None of the above |
| Answer» D. None of the above | |
| 10. |
A plot of log (a x) against time t is a straight line. This indicates that the reaction is of |
| A. | zero order |
| B. | first order |
| C. | second order |
| D. | third order |
| Answer» C. second order | |
| 11. |
Radioactive disintegration is an example of |
| A. | zero order reaction |
| B. | first order reaction |
| C. | second order reaction |
| D. | third order reaction |
| Answer» C. second order reaction | |
| 12. |
A first order reaction takes 40 min for 30?composition. What will be t12? |
| A. | 77.7 min |
| B. | 52.5 min |
| C. | 46.2 min |
| D. | 22.7 min |
| Answer» B. 52.5 min | |
| 13. |
Half life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min? |
| A. | 25% |
| B. | 50% |
| C. | 99.9% |
| D. | 75% |
| Answer» D. 75% | |
| 14. |
In pseudo unimolecular reactions |
| A. | both the reactants are present in low concentration |
| B. | both the reactants are present in same concentration |
| C. | one of the reactant is present in excess |
| D. | one of the reactant is non-reactive |
| Answer» D. one of the reactant is non-reactive | |
| 15. |
Rate constant in case of first order reaction is |
| A. | inversely proportional to the concentration units |
| B. | independent of concentration units |
| C. | directly proportional to concentration units |
| D. | inversely proportional to the square of concentration units |
| Answer» C. directly proportional to concentration units | |
| 16. |
The overall rate of a reaction is governed by |
| A. | the rate of fastest intermediate step |
| B. | the sum total of the rates of all intermediate steps |
| C. | the average of the rates of all the intermediate steps |
| D. | the rate of slowest intermediate step |
| Answer» E. | |
| 17. |
The order of reaction is decided by |
| A. | temperature |
| B. | mechanism of reaction as well as relative concentration of reactants |
| C. | molecularity |
| D. | pressure |
| Answer» C. molecularity | |